From Torncity WIKI - The official help and support guide

Details

Item cooldowns were added to the game to prevent certain items from being used excessively in short periods for huge advantages. These items all share a cooldown timer, known as a "Booster Cooldown".

Every use of booster cause adding certain time to your cooldown timer. You will not be able to use more booster, if the timer will reach over the value of 24 hours. Booster Cooldown is counting down, as per real time.